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    .my-svg {
      width: 400px;
      height: 400px;
      fill: pink;
    }
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  <!-- 
    svg原生使用：
      1. width 宽度
      2. height 高度  配合 viewBox 使用
      3. fill 颜色
      4. viewBox="0 0 1024 1024"  四个值
         前两个值，x y 的偏移量
         后两个值，原始图像的宽高
   -->

  <svg class="my-svg"  width="200" height="200" fill="pink" viewBox="0 0 130 130"  xmlns="http://www.w3.org/2000/svg"><path d="M63.444 64.996c20.633 0 37.359-14.308 37.359-31.953 0-17.649-16.726-31.952-37.359-31.952-20.631 0-37.36 14.303-37.358 31.952 0 17.645 16.727 31.953 37.359 31.953zM80.57 75.65H49.434c-26.652 0-48.26 18.477-48.26 41.27v2.664c0 9.316 21.608 9.325 48.26 9.325H80.57c26.649 0 48.256-.344 48.256-9.325v-2.663c0-22.794-21.605-41.271-48.256-41.271z" stroke="#979797"/></svg>


  
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